Flanged container for electric condensers



March 20, 1951 B. o. N. HANSSON 2,545,651

FLANGED CONTAINER FOR ELECTRIC CONDENSERS Filed April 23, 1946 R V6/Z for BPOP 0. NfiQHSSO)? 5/ 5 3 Patented Mar. 20, 1951 imiiNGEnooltTAm RfpoR CONDENSERS arms Olov Nikolaus Hansson, Angby, Sweden, as-

iign'dl' to AHnianna Svenskafilektriska Aktiebolaget, Vasteras, Sweden, a Swedish corporation Application April 23, 1946, -Sei' ial-Noh664fl 53 In Sweden May 5, 1945 3 Claims.

The present invention relates to containers for electric liquid impregnated condensers, especially those in which the enclosed liquid stands under pressure. These containers are generally made as a tank with flexible ends, whereby the cylincondensers, where the foils, protruding outside the condenser roll, make heat-dissipating contact with a wall in the container, the cylindrical form of tank has proved to have certain drawbacks, mainly consisting therein that only one of the end Walls of the container with comparatively small cooling capacity has been possible to use for this purpose. For foil-cooled condensers a square tank from a cooling point of view was more advantageons to use, because in this the four walls may serve for the cooling of the foils. If the tank itself must take the pressure of the enclosed expanding liquid, the tank must be combined with two circular openings in which flexible, pressure-equalizing steel covers may be inserted, because a flexible square wall, for instance an end wall, cannot resist occurring stresses.

The container forming the object of the present invention is a tank of the kind mentioned above. To its principal height it has prismatic form with rectangular or square section and at the top and/or bottom is provided with end pieces with circular section. Thus this container is a, square tank with circular ends which similarly to a cylindrical tank can be provided with circular pressure-equalizing covers. If its square sides are provided with stifienings, for instance cooling fins, it will stand as high pressures as a cylindrical tank, but its cooling capacity will be several times larger.

The tank may be manufactured from thin plate. Preferably it is at first made as a rectangular prism which is converted at the ends in a press or a mandrel lathe. It may also be made as a cylinder which is given prismatic shape except at the ends by pressing.

The attached drawing shows some forms of arrangement of the invention.

Fig. 1 is a perspective view of one form of the container.

Fig. 1a is a perspective view of the top end cover.

Figs. 2, 3 and 4 are views corresponding to Fig. 1 but showing modified forms of the container.

Fig. 1 shows a prismatic tank I with square inner section. Its end openings at the top 2 and bottom 3 have been converted to circular section with a. diameter which is equal to or less than .the side of the square. In about the middle of the tank a connecting wall 4 is welded perpendicularly to the four inner walls of the tank. These are smooth, so that the protruding foils of condenser rolls of common forms may lie against them.

The circular openings 2 and 3 in the ends of the tank are covered by smooth or corrugated walls, one of which at least should serve as a pressure equalizer for the oil enclosed in the tank. Fig. 1a shows a suitable construction for this purpose. The pressure equalizing wall consists here of a flexible steel membrane 8, provided with a ring 9 on the edge In of which a perforated disc H is welded. The whole forms a double sided cover, the edge I0 of which is welded to the end openings 2 or 3 of the tank either so that the steel membrane 8 and its ring 9 stick down in the tank or will lie above the tank opening 2 or 3.

As the steel membrane is Welded to the tank by means of a ring the weld will not be afiected by the movements of the flexible membrane. The sheet disc II has for its purpose to form a connecting wall maintaining the circular section at the ends of the tank when the inner pressure in the tank tends to deform the smooth wall in the same. The disc II is thus only exposed to tensile stresses. Lying above or below the steel membrance 8 at the welding of the cover to the tank, the disc must not be tight but perforated, for instance as shown on the drawing. It may even be replaced by bars welded diagonally to the tank.

In Fig. 2 the tank has the same arrangement as in Fig. '1, but the tank is provided with shrunk-on or welded-on cooling fins round the four sides, perpendicularly to the length direction of the tank.

In Fig. 3 the square section of the tank has been converted to circular section with a diameter which is larger than the side of the square. The container should have about the same circumference on the circular part as on the square part. The cooling fins 6, going in the longitudinal direction of the tank are Welded to the four sides.

Fig. 4 shows a tank of the same kind as in Fig. 3, but without cooling fins. The four sides are provided with salient stifienings I, going in the lon gitudinal direction of the tank and forming ducts on the inside for facilitating oil circulation and the application of leads to the various condenser rolls in the tank. On the outside these stifienings may serve as cooling fins, but of course other cooling fins of one or another kind may also be welded on the tank sides.

I claim as my invention:

1. A container for an electric condenser, comprising four flat side walls, a circular end portion on each end of the container, a flexible circular cover applied to each end portion, and reinforcing cooling fins secured to the'external surfaces of said flat walls.

2. A container according to claim 1, comprising an internal rectangular wall located about the mid-portion of said container and secured perpendicularly to the internal surfaces of said flat walls.

3. A container according to claim 1, comprising stiffening members formed in the said flat walls and extending longitudinally thereof.

BROR OLOV NIKOLAUS, HANSSQN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Great Britain Oct. 4, 1928 

